Fix upcoming Clippy lifetime warnings

[Ogeon]

Clarifies implicitly named lifetimes, and elides named lifetimes that only appear once. Shouldn't affect the type checking.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (e37e2fe) to head (d78e89d).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
- Coverage   82.87%   82.83%   -0.04%     
==========================================
  Files         130      131       +1     
  Lines       20199    20162      -37     
  Branches    20199    20162      -37     
==========================================
- Hits        16739    16702      -37     
  Misses       3337     3337              
  Partials      123      123              

Components	Coverage Δ
palette	82.90% <0.00%> (-0.04%)	⬇️
palette_derive	81.98% <ø> (ø)

[codspeed-hq]

CodSpeed Performance Report

Merging #419 will improve performances by 14.99%

_{Comparing clippy_fixes (d78e89d) with master (e37e2fe)}

Summary

⚡ 2 improvements
✅ 45 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	clippy_fixes	Change
⚡	matrix_inverse	438.9 ns	381.7 ns	+14.99%
⚡	multiply_3x3	316.7 ns	287.5 ns	+10.14%